Featuring a main body made from 100% New Zealand Merino wool with water resistant nanotechnology, the Icebreaker Men's Sierra Hood is a warm and windproof outer layer that's ready for adventures in cooler, wet conditions.While it incorporates water resistant polyester in the sleeves and hood for extra protection from wet conditions, the Sierra Hood is made from Icebreaker's Realfleece Nano wool, which offers great protection from the elements. Realfleece brushed Merino wool fleece is a natural and sustainable alternative to synthetic fleece, and has anti microbial and temperature regulation properties created by Mother Nature instead of by lab chemistry. Highly versatile, the Sierra Hood is a smart outer layer choice for winter hikes or even skiing. The shaped hood is adjustable to keep warmth sealed in around your head, and 100% Merino is also included on the inner cuffs for added warmth at those points. An internal storm flap keeps out chilly drafts, as well. The Sierra Hood incorporates a secure zippered chest pocket with media cord port and zippered hand pockets to safely stow essentials.And you can feel good about the sustainability of the Sierra Hood each Icebreaker garment includes a code that can be entered on the Icebreaker website to trace the environmental footprint of the materials.The Icebreaker Men's Sierra Hood has a regular fit and is available in your choice of size and color. Large Black, Large LargoForce, Medium Black, Medium LargoForce, XLarge Black, 100533 001 LG, 100533 J91 LG, 100533 001 MD, 100533 J91 MD, 100533 001 XL